ï»¿ Why small mercury drops are spherical but large ones are flat? from Physics Mechanical Properties of Fluids Class 11 Manipur Board

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Why small mercury drops are spherical but large ones are flat?

A drop of mercury tries to acquire the minimum surface area due to surface area, for any given volume minimum area is for sphere. The effect of gravity is less for small droplets, hence the mercury drops are nearly spherical in shape.

As  the size of drop increases, force of gravity on the drop increases which tries to deform the shape. Therefore, bigger drops are flat.
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Why solids have definite shape while liquids do not have definite shape?

Solids: Intermolecular forces are very strong and thermal agitations are not sufficiently strong to separate the molecules from their mean position. Solids are rigid and hence they have definite shapes.
Liquids: In liquids intermolecular forces are not sufficiently strong to hold the molecules at definite sites, as a result they move freely within the bulk of liquid, therefore, do not possess definite shapes. Liquids take the same shape as that of the container.
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What is fluid?

Any material that can flow is a fluid. Liquids and gases are examples of fluid.

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What is hydrodynamics?

Hydrodynamics is the branch of science that studies about the force exerted by the fluids or acting on the fluids.
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What is hydrostatics?

Hydrostatics is the branch of fluid mechanics that studies incompressible fluids at rest. The study of fluids at rest or objects placed at rest in fluids is hydrostatics.
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Do intermolecular or inter-atomic forces follow inverse square law?

No. Intermolecular and inter-atomic forces do not obey the inverse square law.
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